That would be the nervous system.
Well I do say from my studies and experience, that a warm up should be less intense than the exercise, because you don't wan't to workout to hard before getting to the main exercise, that's like having a huge appetizer then then main course meal. So my final answer would be C. Hope this helps
An athlete's arousal level refers to
D. the "mind-set" of the athlete in reference to competition and intensity of the exercise or sport.
